<script setup>
import { userRegisterService, userLoginService } from '@/api/user' 
import { useUserStore } from '@/stores'
import { User, Lock } from '@element-plus/icons-vue'
import { ref, watch } from 'vue'
import { useRouter } from 'vue-router'
const isRegister = ref(false)
const form = ref()
// 整个用于提交的form数据对象
const formModel = ref({
  username: '',
  password: '',
  repassword: ''
})

// 整个表单的校验规则
// 非空校验 required: true message消息提示 trigger触发校验的时机 change blur
// 长度校验 min:xx max:xx  
// 正则校验 pattern: 正则规则  \S非空字符
// validator(rule, value, callback)
// (1) rule 当前校验规则的相关信息
// (2) value 所校验的表单元素目前的表单值
// (3) callback   无论成功还是失败 都需要callback回调
//       -callback() 校验成功
//       -callback(new Error(错误信息)) 校验失败 
const rules = {
  username: [
    { required: true, message: '请输入用户名', trigger: 'blur' },
    { min: 5, max: 10, message: '用户名必须是5-10位字符', trigger: 'blur' }
  ],
  password: [
  { required: true, message: '请输入密码', trigger: 'blur' },
  { pattern: /^\S{6,15}$/, 
    message: '密码必须是6-15位非空字符', 
    trigger: 'blur' }
  ],
  repassword: [
  { required: true, message: '请输入密码', trigger: 'blur' },
  { pattern: /^\S{6,15}$/, 
    message: '密码必须是6-15位非空字符', 
    trigger: 'blur' },
  {
    validator: (rule, value, callback) => {
      // 判断当前 value 和 form 表单中的收集的 password 是否一致
      if (value !== formModel.value.password) {
        callback(new Error('两次输入的密码不一致'))
      } else {
        callback()  // 就算校验成功 也需要callback
      }
    }
  }
  ]
}

const register = async() => {
  // 注册成功之前 先进行校验 校验成功 -> 请求 校验失败 -> 自动提示
  await form.value.validate()
  await userRegisterService(formModel.value)
  console.log('注册成功，即将显示 ElMessage') // 检查是否执行到这里
  ElMessage.success('注册成功')
  isRegister.value = false
}
// 切换的时候 重置表单内容
watch(isRegister, () => {
  formModel.value = {
     username: '',
     password: '',
     repassword: ''
  }
})

const userStore = useUserStore()
const router = useRouter()

const login = async() => {
   await form.value.validate()
   const res = await userLoginService(formModel.value)
   userStore.setToken(res.data.token)
   ElMessage.success('登录成功')
   router.push('/')
}
</script>

<template>
  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">

      <el-form
       :model="formModel" 
       :rules="rules"
       ref="form" 
       size="large" 
       autocomplete="off" 
       v-if="isRegister">
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
           v-model="formModel.username"
           :prefix-icon="User" 
           placeholder="请输入用户名">
          </el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item prop="repassword">
          <el-input
            v-model="formModel.repassword"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入再次密码"
          ></el-input>
        </el-form-item>
        <el-form-item>
          <el-button @click="register" class="button" type="primary" auto-insert-space>
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = false">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>
      <el-form
        :model="formModel"
        :rules="rules" 
        ref="form" 
        size="large" 
        autocomplete="off" v-else>
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
           v-model="formModel.username"
           :prefix-icon="User" 
           placeholder="请输入用户名">
          </el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="formModel.password"
            name="password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox>记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <el-form-item>
          <el-button
            @click="login" 
            class="button" 
            type="primary" 
            auto-insert-space
            >登录</el-button
          >
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = true">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
.login-page {
  height: 100vh;
  background-color: #fff;
  .bg {
    background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }
  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;
    .title {
      margin: 0 auto;
    }
    .button {
      width: 100%;
    }
    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>
